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Remuneration of key management - Remuneration of group leadership team (Details) - Group leadership team - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items]      
Short-term benefits € 13 € 17 € 20
Post-employment benefits 1 1 2
Share-based payments 13 13 12
Termination benefits 0 1 0
Total € 27 € 32 € 34